EP2229099A1 - Optimierung eines strömungssensors - Google Patents
Optimierung eines strömungssensorsInfo
- Publication number
- EP2229099A1 EP2229099A1 EP08845961A EP08845961A EP2229099A1 EP 2229099 A1 EP2229099 A1 EP 2229099A1 EP 08845961 A EP08845961 A EP 08845961A EP 08845961 A EP08845961 A EP 08845961A EP 2229099 A1 EP2229099 A1 EP 2229099A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- resistor
- sensor
- flow
- flow direction
- angle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
- A61B5/087—Measuring breath flow
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
- G01F1/40—Details of construction of the flow constriction devices
- G01F1/42—Orifices or nozzles
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
- A61B5/091—Measuring volume of inspired or expired gases, e.g. to determine lung capacity
Definitions
- the invention relates to a flow sensor for measuring respiratory volume and flow rate in pulmonary function diagnostics and performance diagnostics according to the preamble of claim 1.
- Sensors for flow measurement are used in a variety of different embodiments and methods.
- Common measuring methods for flow measurement work, for example, according to the principle of the multiheated wire, with ultrasonic measurements or with the differential pressure measurement.
- the test person breathes through a mouthpiece, which is connected to a flow sensor via appropriate hose connections, through which the test person breathes via the mouthpiece and the hose connection.
- the flow rate of the exhaled air can be determined and based on the known cross sections of the flow measuring device from the respiratory volume can be calculated.
- the invention relates to an improvement of a flow sensor for differential pressure measurement.
- a flow resistance is introduced into the flow path.
- the pressure drop that is, the difference between the pressure before the resistance and the pressure after the resistance.
- This pressure drop represents a measure of the rate at which the air passes through the resistor.
- the relationship between flow rate and pressure drop depends on the shape of the resistor. For example, in a fine mesh screen as a drag, the flow after passing through the screen remains laminar, i. There are no turbulences, and there is a linear relationship between differential pressure and flow velocity.
- An inventive sensor has an interior, in which a surface formed resistance to the air flow is arranged.
- This sheet resistance has an angle of its resistance plane against the flow direction, which differs from 90 degrees. Due to the arrangement of the resistor at an angle to the flow direction can be at the same a larger resistive area is used to reduce the resistance and thus the back pressure on the lung, without negatively affecting the linearity of the resistance.
- the ratio of sensor area of the angled resistor to the vertical cross-sectional area of the flow sensor, which corresponds to the area of a conventionally arranged resistor, is a factor where alpha is the angle of the angled resistor to sin ⁇
- the angle at which the resistance to the flow direction is arranged can vary in the range of 20 to less than 90 degrees. Angles that are shallower than 20 degrees to the flow direction do not bring significant
- Range for the angle to the flow direction is between 30 and 80, more preferably between 40 and 50 degrees. Particularly preferably, the
- Resistance can be arranged at an angle of 45 degrees.
- an area of about 1200 to 2400 qmm is provided, wherein the cross-sectional area should preferably be in the range of 1600 to 200 mm2.
- the shape of the cross section is generally relatively freely selectable, with a circular or oval cross-section is preferred. Particularly preferred is an elliptical cross section is used, in which the shorter major axis between 17 and 24 mm, preferably between 19 or 22 mm, and particularly preferably 21 mm, and a longer major axis between 22 and 32 mm, preferably between 25 and 29 mm and more preferably 28 mm long.
- the sensor may have an angle only to one of the two main axes or to both main axes.
- FIG. 1 a section through a flow sensor according to FIG.
- FIG. 3 shows a flow sensor according to the invention in a cross section along the line A from FIG.
- FIG 1 shows a flow sensor 1, as is customary in the prior art.
- the flow sensor 1 consists of a housing 2, which is designed as a hollow profile in the manner of a tube.
- the embodiment in Figure 1 shows a one-piece housing, multi-part housing but are also possible.
- a flow resistance 3 is arranged, which is perpendicular in the prior art, i. is arranged at an angle 5 of 90 degrees to the flow direction 4.
- connections for connection of the pressure measuring devices (not shown in the drawing).
- FIG. 2 shows the flow sensor 11 according to the invention.
- the resistor 13 is arranged, which has an angle 15 to the flow direction 14, which is smaller than 90 degrees. Even with flow sensor according to the invention are located in the flow direction 14 before and after the resistor 13 connections are not drawn to connect the pressure measuring devices, by means of which the pressure difference or the pressure drop can be measured at the flow resistance.
- the housing 12 may also be designed in one or more parts. In a particularly preferred embodiment, the housing is integrated by injection molding with the Flow resistance produced. Depending on the requirements, a constant or variable flow resistance can be used.
- Figure 3 shows a section through the flow sensor in Figure 2 along the line A.
- the housing 12 has an elliptical cross-section, in which the flow resistance 13 is arranged at an angle, so that the section line A, the flow sensor 13 approximately in the Middle cuts.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP08845961A EP2229099A1 (de) | 2007-10-31 | 2008-10-29 | Optimierung eines strömungssensors |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07119713 | 2007-10-31 | ||
PCT/EP2008/064667 WO2009056563A1 (de) | 2007-10-31 | 2008-10-29 | Optimierung eines strömungssensors |
EP08845961A EP2229099A1 (de) | 2007-10-31 | 2008-10-29 | Optimierung eines strömungssensors |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2229099A1 true EP2229099A1 (de) | 2010-09-22 |
Family
ID=40279108
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08845961A Ceased EP2229099A1 (de) | 2007-10-31 | 2008-10-29 | Optimierung eines strömungssensors |
Country Status (4)
Country | Link |
---|---|
US (1) | US20110046501A1 (de) |
EP (1) | EP2229099A1 (de) |
DE (1) | DE202008017985U1 (de) |
WO (1) | WO2009056563A1 (de) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2000800C3 (de) * | 1970-01-09 | 1975-11-13 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | MeBvorrichtung zur Erfassung des Atemstromes |
DE4325789C2 (de) | 1993-07-31 | 1997-10-30 | Zan Mesgeraete Gmbh I G | Verfahren zur Kalibrierung von Strömungsblenden sowie Strömungsmesser mit derartigen Strömungsblenden |
AU4709501A (en) * | 1999-11-30 | 2001-06-18 | Qrs Diagnostic, Llc | Slant fabric spirometer design |
CA2386639A1 (en) * | 2002-05-16 | 2003-11-16 | Dynamic Mt Gmbh | Portable electronic spirometer |
JPWO2006062007A1 (ja) * | 2004-12-09 | 2008-06-05 | コニカミノルタエムジー株式会社 | 流量測定装置 |
-
2008
- 2008-10-29 DE DE202008017985U patent/DE202008017985U1/de not_active Expired - Lifetime
- 2008-10-29 EP EP08845961A patent/EP2229099A1/de not_active Ceased
- 2008-10-29 WO PCT/EP2008/064667 patent/WO2009056563A1/de active Application Filing
- 2008-10-29 US US12/739,985 patent/US20110046501A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO2009056563A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2009056563A1 (de) | 2009-05-07 |
US20110046501A1 (en) | 2011-02-24 |
DE202008017985U1 (de) | 2011-02-17 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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111Z | Information provided on other rights and legal means of execution |
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AX | Request for extension of the european patent |
Extension state: AL BA MK RS |
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DAX | Request for extension of the european patent (deleted) | ||
17Q | First examination report despatched |
Effective date: 20110707 |
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REG | Reference to a national code |
Ref country code: DE Ref legal event code: R003 |
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STAA | Information on the status of an ep patent application or granted ep patent |
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18R | Application refused |
Effective date: 20131202 |